Feeding mechanism for sewing-machines.



No. 664,772. I Patontd Doc; 25, I900. I

J McKENNEY.

FEEDING MECHANISM FOR SEWING MACHINES.

(Appliclfion filed Sept. 9, 1896.) (In Modal.) 2 Shasta-Shoot I.

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No. 664,772. Patented Dec. 25, I900. J F. MGKENNEY.

FEEDING MECHANISM FOR SEWING MACHINES.

(Application filed Sept. 2, 1896.) (lo Indal.) 2 Shoots-Shoot 2.

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UNITED STATES PATENT OFFICE.

J FREEMAN MOKENNEY, OF BALTIMORE, MARYLAND.

FEEDING MECHANISM FOR SEWING-MACHlNES.

' SPECIFICATION forming part of Letters Patent No. 664,772, dated December 25, 1900. Q

Application filed September 2, 1896. Serial No. 604,613. (No od l.)

To all whom it may concern.-

Be itknown that I, J FREEMAN MOKENNEY, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Sewing-Machin es; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention is an improvement in sewingmachines; and it consistsin the novel features of construction and combination of parts hereinafter described, reference being had to the accompanying drawings, which illustrate one form in which I have contemplated embodying my invention, and saidinvention is fully described in the following description and claims.

Referring to the said drawings, Figure 1 represents a vertical longitudinal section through a sewing-machine embodying my invention. Fig. 2 represents a top plan view of the machine, the horizontal arm being shown in section. Fig. 3 represents a vertical transverse section of the machine on the line 3 3 of Fig. 1. Fig. 4 is a detail view of the devices for transmitting motion to the feeding mechanism. Fig. 5 is a detail view of the link connecting the crank on the driving-shaft with the shuttle-operating devices.

In the drawings, A represents the vertical hollow standard of the machine, extending upward from the bed-plate B, and A is the overhanging arm.

G represents the driving-shaft, which extends horizontally through the overhanging arm, is journaled in suitable bearings, and is operativelyconnected with the needle-arm C in any usual or preferred manner for imparting vertical reciprocating motion thereto. Adjacent to its central portion the shaft 0 is provided with a crank 0, having a very short throw,and said crank is provided with a ball a.

A vertical rock-shaft D is mounted in the standard A in the following manner: The

upper end of said shaft is provided with a' formed integrally withthe bed-plate. The

screw is also provided with a jam-nut (Z and in detail in Fig. 5.) This link is provided ateach end with a circular recess, the walls of which are grooved in a well-known manner to receive the balls 0 and 01 and each of the circular portions of the link surrounding said recesses is sawed and provided with adj usting-screws to enable the link to be placed in engagement with said balls and tightened upon them.

The vertical rock-shaft D- is provided adjacent to its lowerend beneath the bed-plate B with a shuttle-operating arm D, formed integrally therewith or secured thereto in any desired manner. I prefer to form this arm of sheet-steel for lightness, which may be corrugated, if desired, to give it greater strength. The outer end of the arm D is provided with a shuttle-carrier of any usual or preferred form moving in a suitable shuttle-race. The

link connecting the short crank c and the arm 01 is very short, as will be seen, and consequently the distance between the axis of rotation of the shaft 0 and the axis of movement of the link-to wit, the arm d -will be very slight when the parts are in the position shown in Fig. 2. As the crank moves around on that side of its axis of rotation, therefore, the arm d will be given a somewhat long dwell or period, during which it is given little or no motion. The effect of this on the shuttle is to slow it up quickly and hold it substantially still for a longer period than is usual at the end of a stroke of the shuttlearm. By means of this variable motion the needle-thread or upper thread is permitted to leave the heel of the shuttle and to be drawn quite up into the throat-plate or needle-plate ready to tighten before the shuttlethread is tightened. I tightened simultaneously and each stitch is completed at once, making what is known in the art as the Howe pull, and this makes and extending through a step b, secured to or Thus both threads are or cone-shaped end, and jam-nut g arm f connected therewith. -To this arm is connected a vertically moving and Oscillating rod f which extends downward through an Oscillating guide .01 slee e f 3, pre ide w th a sphericalenlargement or ball f adjacent to its center. This ball is engaged by a bracket E, provided with a split circular grooved portion 6, vadapted to be tightened upon saidball, and said bracket-has athreaded stem e,.which extends through a vertical slot a in the standard Aandiis providediwith a milledorwing nut e =By loosening this nut the bracket and the sleeve f can be adjnsted vertically to change therenter of oscillationof said sleeve and the rod f and therebythethrow of thelower end of the rod, and this adjnstmentservesto varythe move? ment of the feed -.plates and regulate the length of the stitch.

G represents a pivoted hanger which is hung in brackets bh', projecting downward from the bottom of the bed-plate The hanger consists of a rod G, having a coneshaped projection or center at one end engagingatapering recessiin one of thebrackets b, and the other bracket is provided .witha set-screw g, having a cone-shape re ss Q1 gaging a similar ,center on the other end of the rod or bar G, thus allowingfor wear, and said screw is provided with a jamsnn t g. The bar or rod G is provided at each ,end with a downwardly-extending arm g each provided with asst-screw g ,'h avi,ngla,poin,ted

Between said screws is placed a roc-krshaft H, having its ends recessed to receive the screws said .rock-shafit :beingprovided at one end withan arm 72, which is pivotally connected to vthe lower ,endof the rod f3, and atits other end ,with an arm 5h, which is connected with the iced-plate of the machine. It will be seien that the rock-shait is .free to oscillate in its shearing and also to move bodily laterally by reason of its pivoted hanger .G,,so that the rod f will impart to the ieedeplate vertical and horizontal movements, the extent of which bracket E.

'It will be noted that in the construction of the parts described great simplicity of construction is obtained and that all the parts can lie accurately adj Listed with respect to each other for correct operation and can also 7 b adjusted to take p wee The mechanism for operating the shuttle is not claimed herein, as the same forms the s b ect of a .divieiera a pl ation eria l'8',626, filed May81, 190D.

VV hat 'I claim, and ,desire to secure by Letters Patent, isp 1. In a sewinginacliine, the ,con hination i h a reek-shah l vi s a arm extendin e e rom and car y n he et en as n e ur ace, ref a r veted "hanger fe said ee -s a a ese H-et nd waite -fin l y 7 ving red v p r t v ly connected as said ek-sha t and th rdtivir r hefit ns mm t stant al y a descr bedt a weak-sha t h v ng r g d arm extending there rom, one 9f sa d arms ea r is th w k eng ng t e -sur ace, e a s a ng and l ng tudinally m 1 re 99 ieet d t the-e her arm .e said a t, he dr ving-sha am ier #1 112 n the reqa i meaem nfist seid xeda a pZvQt-ed a er or ai fee z hafi l151d5jfl y described.

3- asewing-meehi ethe elebiaat r yvilLhe regulated the position of the" wi ha r ckrsha tean y n theMar ns? h s fee drspriace of a ngerfor sup in g said rock-shaft a d r i -e a t laie i sa d r ek-sh h prov d d t an 999 a n, a ert ca re e nre n said axis '7 saidr kshaf v i id eg sle provided wi h sp i riea earing .br

djust ng said trae e and slew na -yoftsaid mete va ythe were! eed n evi es, s bstant al as describedtestime -y -v e e I a t; any si a ur in pre en e of two w tneeeesr '7 J FREEMAN Witne se 1 r 1M AJ FBA .FBANQIS M- HA 1 957 h v ng a hear g t en a e sai sel ee ea '7 bearing portion of the sleeve and m eansi or site , 1's mpa t he requi ite mQt n-t Ba r 1n b- 

